Typewriting machine



Se t. 30 1924,

3. B. CORCORAN TYPEWRITING MACHINE Filed Dec. 2, 1922 ATMW Patented Sept. 30, 1924.

UNITED STATES 1,509,828 PATENT OFFICE.

CORNELIUS B. CORCO'RAN, OF NEW YORK, Y., ASSIGNOR TO UNDERWOODiTYPE- WRITER COMPANY, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE.

:rYrEwnrrInc MACHINE.

Application filed December 2, 1922. Serial No. 604,468.

To all'who'm. it may concern:

Be it known that I, CORNELIUS B. Con- CORAN, a citizen of the United States, residing in borough of the Bronx, in the county of the Bronx, city and State of New York,

have invented certain new and useful Improvements in Typewriting Machines, of which the, following is a specification.

This invention relates to sound-deadening means for typewriting machines, and is in the nature of a sound-dampening shoe into which a typewriter maybe set and from which it may be readily removed.

A feature of the invention consists in the provision of a new article of manufacture in the nature of an improved sound-deadening appliance which is effective in use, simple in structure, economical to manufacture and suited for application to standard typewriting machines already in use.

The shoe may comprise a shell formed of a back, two sides and a bottom or sole, said shell being formed of any suitable material, such as sheet-material, preferably thin sheet-metal.

The shell may be lined with sound-deadening material, such as felt, the dimensions of the shell and the thickness of the lining being such as to permit the insertion of the machine while assuring contact between the lining and the frame of the machine.

The edges of the shell may be turned inwardly to form beveled edges to assist in holding the lining in position and for concealing the lining at the edges of the shoe when the machine is fitted therein.

The shoe may be provided at the forward edge of the bottom or sole with an upstanding flange, back of which the front feet of the typewriter are placed. Preferably the flange is lined with sound-deadening material.

To permit the ribbon-feeding mechanism 1 of the typewriting machine to be manipulated from the outside of the shoe, one of the walls may be provided, in alignment with a transverse ribbon-actuating shaft,

with an opening through which a short shaft, having a finger-wheel at its outer end, ma be inserted, and secured to the first shaft. rovision may also be made of a controllin device for attachment to the shaft, sai device projecting through said opening when so attached.

To support the shoe, provision may be made of supports or rests having devices by which they may be readily attached'to the bottom of the shell, preferably near the corners thereof.

It should be understood that the lining of the shoe is of thick, soft material so as to conform to the shape of the frame where in contact therewith.

Other features and advantageswill hereinafter appear.

In the accompanying drawings, 1 Figure 1 is a side elevation showing the sound-deadening shoe and an Underwood standard typewriter in proper relative position for use, part of the shoe being broken away to show the underlying structure.

Figure 2 is a front elevation,/ partly the typewriting machine has side openings 15 and a back opening, not shown, and com- .prises front posts16, rear posts 17, a forward or keyboard-extension 18 and a front plate 18. v 7

Under certain conditions, it is extremely desirable to eliminate to as great an extent as possible the noise produced in the operation of the machine. 'According to the pres- I ent invention, the desired result may be obtained by placing the machine in a so-called shoe 19,.comfprisin'g a shell 20- of suitable material, pre erably of sheet-metal, and having a thick soft lining 21 of sound-deadening materiaL- The shell 20 may comprise a back wall 22, side walls 23 and a bottom or sole 24, these parts being secured together in any suitable manner. The lining 21 may. be of any suitable material, such as felt, and may be applied to'and secured to the shell in any suitable. manner. Preferably the edges, of the shell 20' are turnedinwardly to form no i beveled portions to assist in holding the lining in position and to hide the edges thereof, and the corners .of the shell are formed as indicated in Figure 4. At its front edge the sole 24 is provided with an upstanding flange 25 having a portion of the lining 2.1 at its inner face.

The typewriter is provided with feet 26, preferably of'rubber, at the lower ends of the posts 16 and 17, and the flange 25 is so positioned that, when the machine is placed in the shoe, the feet 26 at the front of the machine will rest just inside the lining at the rear of the flange.

As shown in Figure 1, the frame 14 of the typewriter is provided with a recess 27 on each side to avoid interference with the carriage as the latter travels from one side to the other of the frame. Corresponding recesses 28 are therefore provided in the upper edges of the side walls 23 of the shoe. The frame 14 is also provided with brackets 29 extending laterally from the rear post 17, and the side walls 23 of the shoe are therefore provided with recesses 29 to receive said brackets. 1

The machine includes means for feeding the ribbon 30 from one side to the other of the printing point, said ribbon-feeding means comprising a transverse shaft 31 having a ratchet-wheel 32 by which it is driven during the o eration of the machine. Near each side 0 the frame 14 the shaft 31 is provided with an outwardly-facing bevel gear. 38, and by shifting the shaft longitudinally either one or the other of the bevel gears 33 may be brought into mesh with a bevel gear 34 on the lower end of a'vertical shaft. 35 connected with a ribbon-spool at its upper end. Direct control of the shaft 31 is ordinarily effected by means of a handle, not shown, secured to the outer face of the ratchet-wheel 32. When the machine is placed in the shoe 19, access to said handle is prevented.

In order that the shaft 31 may be operated from the outside of the shoe, the usual handle is removed from the ratchet-wheel 32 and replaced by a member 36 threaded in-" ternally to receive the threaded inner end of a short shaft 37, projecting through an opening 38 provided in the adjacent side wall of the shoe. The shaft 37 is provided at its outer end with a knurled head or finger-wheel 39, and the directions of the threads in the member 36 and on the end of the shaft 37 are such that, in turning the knurled head 39 in.a direction to turn the shaft 31 in the same'direction' as during the normal operation of the machine,

the shaft 37 will tend to become tighter in the'member 36.

In order to protect a desk or table on which the shoe 19 is placed, rests or-supports 40, preferably of rubber, are fastened the fastener being rendered effective by pressing down the ends of the prongs 43 against the inner face of the bottom or sole 24:.

It should be understood that the lining 21 serves not only to prevent the escape of soundin certain directions, but to reduce the reflection of sound and to damp vibrations in the machine frame and 'in' the shell 20. In practice it has been found that a very substantial reduction in the noise of operation of a typewriter is obtained by using the .shoe of this invention. 1

The side walls, back wall and floor con stitute a sound-deadening unitary sheathing which boxes in the sides, rear and bottom of the typewriter framework and constitutes a permanent member of the typewriting machine in use and also in transportation, as distinguished from a cabinet' or receptacle into which a' typewriter is loosely dropped, and out of which it is takenv for transportation. This sheathing has a I thick lining of sound-deadening felt, and

the typewriter has cushioned feet supported upon the floor of the sheathing. The sheathing is closely fitted to the typewriter frame and grasps or'cramps the sides thereof, to v dampen the sound vibrations of said frame. Moreover, the frame is clasped also or cramped between the felt-lined frontflange 25 and the felt-linedrear wall, further dampening the sound. The boxing or sheathing, being a permanent member of the typewriting machine, is cushioned on its under side to stand upon the desk.

Variations may be resorted to. within the scope of the invention, and portions of the improvements may be used without others.

Having thus described my invention, I claim: r

1. The combination with a typewriting machine comprising a framework, of a sound-deadening unitary sheathing formed with side walls, back wall and floor and boxing in the sides, rear and bottom of the typewriter framework and having a thick lining of sound-deadening felt or material, the framework having cushioned feet supported upon the floor of the sheathing, said sheath ing firmly attached to the'framework and constituting a permanent member of the .typewriting machine and fitted closely thereagainst and clasping the sides of the same and dampening the sound vibrations of the framework.

2. The combination with a typewriting' machine compri-si a framework, of a sound-deadening un1tary sheathing formed with side walls, back wall and floor and box-v ing in the sides, rear and bottom of the typewriter framework and having a thick lining of sound-deadening felt or material,

the framework having cushioned feet supported upon the floor of the sheathing, and

cushioned feet provided upon the bottom of said sheathing directly below the typewriter feet, said sheathing firmly attached to the framework and constituting a permanent 7 member of the typewriting machine and fitted closely thereagainst and clasping the sides of the same and dampening the sound vibrations of the framework.

3. The combination with a typewriting' machine comprising a framework, of a sound-deadening unitary sheathing formed with side walls, back wall and floor and boxing in the sides, rear and bottom of the typewritenframework and having a thick lining of sound-deadening felt or material, the

framework having cushioned feet supported upon the floor of the sheathing, said sheathing firmly attached to the framework and constituting a permanent member of the 'typewriting machine and fitted closely thereagainst and clasping the sides of the same and dampening the sound vibrations of the framework, said sheathin also comprising a sound-deadening front 1% the floor in front ofthe forward typewriter feet, the framework being clasped or cralrlnped between said flange and said rear wa ange rising from 4. The combination with a 'typewriting machine comprising a framework, of a sound-deadening: unitary sheathing formed with side walls, back wall and floor and boxing in the sides, rear and bottom of the typewriter framework and having a thick lining of sound-deadening felt or material, the framework having cushionedfeet supported upon the floor of the sheathing, said sheathing firmly attached to the framework and constituting a permanent member of the 

